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Equity Method Investment - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity Method Investments [Line Items]        
Gain loss from equity method investment     $ (129) $ (191)
TyraTech Inc.        
Equity Method Investments [Line Items]        
Equity investment ownership position 15.11%   15.11%  
Gain loss from equity method investment $ (47) $ (191) $ (129) $ (191)
Carrying value of equity investment 2,407   2,407  
Quoted market value of equity investment $ 2,324   $ 2,324